#include<bits/stdc++.h> using namespace std; using ll = long long; void solve() { int n,x=0,y=0; cin>>n; string s; cin>>s; for(int i=0;i<s.size(); ++i) { if(s[i]=='U') y++; else if(s[i]=='D') y--; else if (s[i]=='R') x++; else if(s[i]=='L') x--; if(x==1 && y==1) { cout<<"YES"<<endl; return; } } cout<<"NO"<<endl; } int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); int TC = 1; cin >> TC; cin.ignore(); while (TC--) solve(); }