Link to this code: https://cses.fi/paste/bf851c39006083922f9992/
inp = input()
mx = 1
cur = 1
p = inp[0];
for i in range(1, len(inp)):
    c = inp[i]
    if (c == p):
        cur = cur + 1
        mx = max(mx, cur)
    else:
        cur = 1
    p = c

print(mx)