# your code goes hereimport sys #sys.stdin=open("in","r") for i in range(1,2): n=int(raw_input()) print n s=raw_input() print s assert s.isalpha() ans=0 for i in range(0,26): for j in range(0,26): print "here" if i==j: continue p1 = i p2 = j flag = 1 l = 0 for c in s: if ord(c)-ord('a')!=p1 and ord(c)-ord('a')!=p2: continue if ord(c)-ord('a') == p1: l = l + 1 p1,p2 = p2,p1 else: flag = 0 if flag == 1 and l>1: ans=max(ans,l) print ans
10 beabeefeab
10 beabeefeab here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here here 0