#include <string.h>
#include <stdio.h>
using namespace std;
int ld[]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0,0};
char s[101];
int main()
{
    freopen("cifra.in", "r", stdin);
    freopen("cifra.out", "w", stdout);
    int t;
    scanf("%d",&t);
    /*int s2[]= {2,4,8,6},s3[]= {3,9,7,1},s4[]= {4,6},s7[]= {7,9,3,1},s8[]= {8,4,2,6},s9[]= {9,1};
    int sum=0;
    for(int j=1; j<=100; j++)
    {sum=0;
        for(int i=1; i<=j; i++)
        {
            if(i%10==1)sum+=1;
            else if(i%10==2)sum+=s2[(i-1)%4] ;
            else if(i%10==3)sum+=s3[(i-1)%4] ;
            else if(i%10==4)sum+=s4[(i-1)%2] ;
            else if(i%10==5)sum+=5 ;
            else if(i%10==6)sum+=6 ;
            else if(i%10==7)sum+=s7[(i-1)%4] ;
            else if(i%10==8)sum+=s8[(i-1)%4] ;
            else if(i%10==9)sum+=s9[(i-1)%2] ;
        }
        printf("%d ",sum%10);
    }*/
     for(int i=1;i<=t;i++)
     {
         scanf("%s",s);
           int l=strlen(s);
           int nr;
           if(l>1)
          nr=(s[l-2]-'0')*10+s[l-1]-'0';
          else  nr =s[l-1]-'0';
            printf("%d\n",ld[nr]);
     }
     fclose(stdin);
     fclose(stdout);
    return 0;
}