#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep(i,n)for(int i=0;i<(n);i++)
#define rep3(n)for(;n>0;n--)

void out(){cout<<endl;} template<typename Head,typename... Tail> void out(Head&& head,Tail&&... tail){cout<<head<<" ";out(forward<Tail>(tail)...);}

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int t;
  cin>>t;
  int hoge;
  string a,b;
  rep3(t){
    cin>>a;
    while(a.size()!=1){
      b="";
      rep(j,a.size()-1){
        hoge=a[j]-'0'+a[j+1]-'0';
        //out(a,b,j,hoge,hoge/10+hoge%10);
        if(hoge<10){
          b+=to_string(hoge);
        }else{
          b+=to_string(hoge/10+hoge%10);
        }
      }
      a=b;
    }
    cout<<a<<endl;
  }
}