#include <iostream>
#include <cmath>
#include <cstdio>
#include <cstring>
using namespace std;

const int v[11][11] = {
{0,1,5,2,8,3,9,2,8,7},
{7,8,4,7,3,8,4,1,5,4},
{4,5,9,6,2,7,3,6,2,1},
{1,2,8,1,7,2,8,5,9,8},
{8,9,3,0,6,1,7,0,6,5},
{5,6,2,5,1,6,2,9,3,2},
{2,3,7,4,0,5,1,4,0,9},
{9,0,6,9,5,0,6,3,7,6},
{6,7,1,8,4,9,5,8,4,3},
{3,4,0,3,9,4,0,7,1,0},
};


int main()
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    int T;
    char s[110];
    int len;
    int cif1,cif2;
    scanf("%d",&T);int i;
    gets(s);
    for(i=0;i<T;++i)
    {
        gets(s);
        len = strlen(s);
        if(len == 1)
            cif1=0;
        else
            cif1=s[len-2]-'0';
        cif2=s[len-1]-'0';
        printf("%d\n",v[cif1][cif2]);
    }
    return 0;
}