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#include<fstream>
#include<string.h>
#include<cmath>
using namespace std;
int x[110];
void geni()
{
int i;
x[1]=1;
for( i=2;i<=100;i++)
{
x[i]=(x[i-1]+(long long)(pow(i,i))%10)%10;
/*
y=i%10;
if(y==1 || y==5 || y==0 || y==6 || y==9)
x=x+y;
else
if(y==3)
x=x+7;
else
if(y==2)
x=x+4;
else
if(y==4 || y==8)
x=x+6;
else
if(y==7)
x=x+3;
x=x%10;
*/
}
}
int main(){
int t, n,j;
char s[200];
geni();
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for(j=1;j<=t;j++){
f.get();
f.get(s, 200);
if(strlen(s)>1)
n=(s[strlen(s)-2]-'0')*10+s[strlen(s)-1]-'0';
else
n=s[strlen(s)-1]-'0';
g<<x[n]<<'\n';
}
return 0;}