#include "testlib.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const ll min_hw = 1;
const ll max_hw = 40;

int main(){
    registerValidation();

    ll h = inf.readLong(min_hw, max_hw);
    inf.readSpace();
    ll w = inf.readLong(min_hw, max_hw);
    inf.readEoln();

    ll sx = inf.readLong(1, h);
    inf.readSpace();
    ll sy = inf.readLong(1, w);
    inf.readEoln();

    ll gx = inf.readLong(1, h);
    inf.readSpace();
    ll gy = inf.readLong(1, w);
    inf.readEoln();

    assert(sx != gx || sy != gy);

    vector<string> s(h);
    for (int i = 0; i < h; i++) {
        s[i] = inf.readString();
        assert(s[i].size() == w);
        for(char c : s[i]) {
            assert(c == '.' || c == '#' || c == 'S' || c == 'G');
        }
    }
    inf.readEof();

    assert(s[sx - 1][sy - 1] == 'S');
    assert(s[gx - 1][gy - 1] == 'G');

    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            if(s[i][j] == 'S') {
                assert(i == sx - 1 && j == sy - 1);
            }
            if(s[i][j] == 'G') {
                assert(i == gx - 1 && j == gy - 1);
            }
        }
    }
}