import sys 

lr=sys.stdin.readlines() #lines with linebreaks
ls=[l[:-1] if l[-1]=='\n' else l for l in lr]
n,m=len(ls[0]),len(ls)
for i,l in enumerate(ls):
    if len(l)!=n:
        print('Not block format')
        exit()
    if len(set(l))!=n:
        print('Character repetition in row',i)
        exit()
for i in range(n):
    s=set()
    for l in ls:
        s.add(l[i])
    if len(s)!=m:
        print('Character repetition in column',i)
        exit()
al=set()
for l in ls:
    for c in l:
        al.add(c)
als=''.join(sorted(al))    
if len(als)>26:
    print('Too many different characters:',len(als))
    exit()
print('alpabet = {',als,'} count = ',len(als),sep='')
print('Valid layout')