fff = ' fff fff '
f = ''
ff = False
for fffff in fff:
    if (fffff != ' '):
        f += fffff
        ff = False
    if (ff == True and fffff == ' '):
        continue
    if (fffff == ' '):
        ff = True
        f += fffff
        continue
ffff = 0
ffffff = False
fffffff = False
for fffff in range(len(f)):
    if (fffff == 0):
        if (f[fffff] == ' '):
            ffffff = True
    if (fffff == len(f)):
        if f[fffff] == ' ':
            fffffff = True
    if (f[fffff] == ' '):
        ffff += 1
print((ffff - (fffffff + ffffff)))