#define _USE_MATH_DEFINES #include <algorithm> #include <cstdio> #include <functional> #include <iostream> #include <cfloat> #include <climits> #include <cstring> #include <cmath> #include <map> #include <queue> #include <set> #include <sstream> #include <stack> #include <string> #include <time.h> #include <vector> using namespace std; typedef long long ll; typedef unsigned long long ull; typedef pair<int, int> i_i; typedef pair<ll, int> ll_i; typedef pair<double, int> d_i; typedef pair<ll, ll> ll_ll; typedef pair<double, double> d_d; struct edge { int v, w; }; ll MOD = 1000000007; ll _MOD = 1000000009; double EPS = 1e-10; int INF = INT_MAX / 4; int main() { int T; cin >> T; while (T--) { string S; cin >> S; reverse(S.begin(), S.end()); int r = 0, g = 0, w = 0; bool ok = true; for (int i = 0; i < S.length(); i++) { if (S[i] == 'R') r++; if (S[i] == 'G') { g++; if (g > r) ok = false; } if (S[i] == 'W') { if (g == 0) ok = false; w = min(g, w + 1); } } if (r > g || g > w) ok = false; if (!ok) cout << "im"; cout << "possible" << endl; } }