file = open('24_12931.txt')
s = file.readline()
ans = 'VWXYZ'
while ans in s:
    ans += 'VWXYZ'
while ans not in s:
    ans = ans[:-1]
if 'YZ' + ans in s:
    print(len('YZ' + ans))
if 'XYZ' + ans in s:
    print(len('XYZ' + ans))
if 'WXYZ' + ans in s:
    print(len('WXYZ' + ans))