import re

T = int(input())
for i in range(T):
    S = input()
    pre_S = ''
    while (S != pre_S):
        pre_S = S
        S = re.sub(r'W.*G.*R', '', S)
        print(S)
    if S.count('W') == len(S):
        print('possible')
    else:
        print('impossible')