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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int t,v[10]={0,1,5,2,8,3,9,2,8,7},u1c,u2c,s;
char n[102];
int main()
{
fin>>t;
for(int i=1; i<=t; i++)
{
fin>>n;
u1c=u2c=0;
u1c=n[strlen(n)-1]-'0';
if(strlen(n)>1) u2c=n[strlen(n)-2]-'0';
s=u2c*7+v[u1c];
fout<<s%10<<'\n';
}
return 0;
}