#include <bits/stdc++.h>
using namespace std;
void te() {
	int h, w;
	string s;
	cin >> h >> w >> s;
	for(int r0 = 1; r0 <= h; ++r0)
		for(int c0 = 1; c0 <= w; ++c0) {
			int row = r0, col = c0;
			bool ok = true;
			for(char dir : s) {
				if(dir == 'U') --row;
				else if(dir == 'D') ++row;
				else if(dir == 'L') --col;
				else if(dir == 'R') ++col;
				else assert(false);
				if(row == 0 || row == h + 1 || col == 0 || col == w + 1)
					ok = false;
			}
			if(ok) {
				puts("safe");
				return;
			}
		}
	puts("unsafe");
}
int main() {
	int T;
	cin >> T;
	while(T--) te();
}