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#include<stdlib.h>
#include<stdio.h>
#include<fstream>
#include<math.h>
using namespace std;
int main(){
ifstream in; ofstream out;
in.open("cifra.in"); out.open("cifra.out");
out.clear();
int t, no, v[10],s;
string x;
for(int i=1;i<=9;i++)
v[i]=pow(i,i);
in>>t;
for(int i=1;i<=t;i++){
in>>x;
no=x[x.length()-1]-'0';
s=0;
for(int j=1;j<=no; j++)
s=s+v[j]%10;
out<<s%10<<endl;
}
return 0;
}