#include <stdio.h>
#include <cstring>
int cifra[21]={0,1,5,2,8,3,9,2,8,7,7};
char ch[101],cht;
int main()
{
    FILE *fin,*fout;
    fin=fopen("cifra.in","r");
    fout=fopen("cifra.out","w");
    for(int i=11;i<=20;i++)
    {
        cifra[i]=cifra[i-1]+cifra[i-10];
        cifra[i]%=10;
    }
    int t;
    fscanf(fin,"%d",&t);
    fscanf(fin,"%c",&cht);
    int pos,rez;
    for(int i=0;i<t;i++)
    {
        fgets(ch,101,fin);
        int s=strlen(ch);
        if(ch[s-1]=='\n') s--;
        if(s==1) fprintf(fout,"%d\n",cifra[ch[0]-'0']);
        else
        {
            int nr=(ch[s-2]-'0');
            nr*=10;
            nr+=(ch[s-1]-'0');
            fprintf(fout,"%d\n",cifra[nr]);
        }
    }
}