import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Queue;
import java.util.StringTokenizer;

public class Main {

    void solve() throws IOException {
        int n = ni();
        out: for (int i = 0; i < n; i++) {
            String s = ns();
            if (s.length() < 3) {
                out.println("impossible");
                continue;
            }
            int cntG = 0, cntR = 0, cntW = 0, chkW = 0;
            for (int j = 0; j < s.length(); j++) {
                if (s.charAt(j) == 'G') {
                    cntG++;
                    chkW = 0;
                } else if (s.charAt(j) == 'R') {
                    cntR++;
                } else {
                    cntW++;
                    chkW++;
                }

                if (cntW < cntG) {
                    out.println("impossible");
                    continue out;
                }

                if (cntG < cntR) {
                    out.println("impossible");
                    continue out;
                }
            }
            if (chkW == 0 && cntG == cntR) {
                out.println("possible");
            } else {
                out.println("impossible");
            }
        }
    }

    String ns() throws IOException {
        while (!tok.hasMoreTokens()) {
            tok = new StringTokenizer(in.readLine(), " ");
        }
        return tok.nextToken();
    }

    int ni() throws IOException {
        return Integer.parseInt(ns());
    }

    long nl() throws IOException {
        return Long.parseLong(ns());
    }

    double nd() throws IOException {
        return Double.parseDouble(ns());
    }

    String[] nsa(int n) throws IOException {
        String[] res = new String[n];
        for (int i = 0; i < n; i++) {
            res[i] = ns();
        }
        return res;
    }

    int[] nia(int n) throws IOException {
        int[] res = new int[n];
        for (int i = 0; i < n; i++) {
            res[i] = ni();
        }
        return res;
    }

    long[] nla(int n) throws IOException {
        long[] res = new long[n];
        for (int i = 0; i < n; i++) {
            res[i] = nl();
        }
        return res;
    }

    static BufferedReader in;
    static PrintWriter out;
    static StringTokenizer tok;

    public static void main(String[] args) throws IOException {
        in = new BufferedReader(new InputStreamReader(System.in));
        out = new PrintWriter(System.out);
        tok = new StringTokenizer("");
        Main main = new Main();
        main.solve();
        out.close();
    }
}