поляков 24-166

def maxLine(s):
    mas = []
    for i in range(len(s)):
        if s.rfind(s[i]) != -1:
            mas.append(s.rfind(s[i]) - i)
    return max(mas)


f = open("24-164.txt").readlines()
for s in f:
    if s.count("G") < 15:
        maxL = maxLine(s)
        print(maxL)