import sys
from typing import List, Tuple

MOD = 998244353

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    s = input()
    if 'SKG' in s:
        return 'No'
    s = list(s)
    for i in range(len(s)):
        if s[i] == '.':
            pr = 'S' if i == 0 else s[i-1]
            nx = 'S' if i == len(s)-1 else s[i+1]
            if pr == '.':
                pr = 'S'
            if nx == '.':
                nx = 'S'
            x = set('SKG')
            if pr == 'S':
                x.discard('K')
            if pr == 'K':
                x.discard('G')
            if nx == 'K':
                x.discard('S')
            if nx == 'G':
                x.discard('K')
            s[i] = next(iter(x))
    print('Yes')
    return ''.join(s)


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()