B

#include <bits/stdc++.h>
using namespace std;
int main() {
    int t;
    cin>>t;
    while(t--)
    {
        int n;
        cin>>n;
        string s;
        cin>>s;
        int c=0;
        for(char ch:s) if(ch=='U') c++;
        if(c%2==1) cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
    }
}