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#include "bits/stdc++.h"
using namespace std;
int main(){
	int nn;
	cin >> nn;
	while(nn--){
		int n,m;
		cin >> n >> m;
		string com;
		cin >> com;
		int x = 0, y = 0;
		bool falg = 0;
		rep(i, 0, sz(com)){ 
			if(com[i] == 'L')
				x--;
			if(com[i] == 'R')
				x++;
			if(com[i] == 'U')
				y++;
			if(com[i] == 'D')
				y--;
 
			if(abs(x) > m-1 || abs(y) > n-1){
				cout << "unsafe" << endl;
				falg = 1;
				break;
			}
		}
		if(!falg)
		cout << "safe" << endl;	
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:13:7: error: ‘i’ was not declared in this scope
   rep(i, 0, sz(com)){
       ^
prog.cpp:13:19: error: ‘sz’ was not declared in this scope
   rep(i, 0, sz(com)){
                   ^
prog.cpp:13:20: error: ‘rep’ was not declared in this scope
   rep(i, 0, sz(com)){
                    ^

Standard output is empty