s = 'STjdfhdSTjhf'
if s[0:2] == 'ST':
    s = s[1:]
f = [1] * len(s)
for i in range(1, len(s)):
    if s[i-1:i+1] != 'ST':
        f[i] = f[i-1] + 1
    else:
        f[i] = 1
print(max(f))