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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
long long int pow(long long int baza,long long int exp)
{
long long int p=1;
while(exp)
{
if(exp&1)
p=(p*baza)%10;
baza=(baza*baza)%10;
exp>>=1;
}
return p%10;
}
int main()
{
int s[102];
int i,n,j;
int b=0;
char x[102];
for(i=1;i<101;i++)
{
b+=(pow(i%10,i));
if(b>9)
b%=10;
s[i]=b;
}
fin>>n;
fin.getline(x,105);
for(j=0;j<n;j++){
fin.getline(x,105);
if(strlen(x)>=2)
fout<<s[(x[strlen(x)-2]-'0')*10+(x[strlen(x)-1]-'0')]<<"\n";
else
fout<<s[x[0]-'0']<<"\n";
}
fin.close();
fout.close();
return 0;
}