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#include <fstream>
#include <cstring>
using namespace std;
int i,j,n,s,b,a[105],t,x,k;
char S[105];
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
s=0;
f>>t;
for(i=1;i<=100;i++)
{
b=i;
for(j=1;j<i;j++)
b=(b*i)%10;
s+=b;
s%=10;
a[i]=s;
//g<<a[i]<<'\n';
}
for(i=1;i<=t;i++)
{
f>>S;
n=strlen(S);
if(n>1)
x=(S[n-2]-'0')*10+S[n-1];
else x=S[n-1]-'0';
g<<a[x]<<'\n';
}
return 0;
}