#include<bits/stdc++.h>
#include<chrono>

#define fast_io ios_base::sync_with_stdio(false);cin.tie(NULL)
using namespace std;
auto start = chrono::steady_clock::now();
void init_code(){
    fast_io;
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif 
}
bool equal(string s,string ss){
    for(int i=0;i<s.length();i++){
        if(s[i]!=ss[i]) return false;
    }
    return true;
}
int main(){
    init_code();
    int t;
    cin>>t;
    while(t--){
        string s,t;
         int n;
        cin>>n;
        cin>>s>>t;
       
        if(equal(s,t)) cout<<0<<endl;
        else cout<<1<<endl;
        
    }
   
    return 0;
}