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#include <fstream>
#include <cstring>
using namespace std;
int main()
{
ifstream in("cifra.in");
ofstream out("cifra.out");
int cifra[102],t,i,j,len;
char a[102];
in>>t;
for(i=1;i<=99;i++)
{
cifra[i]=i;
for(j=1;j<i;j++)
{
cifra[i]*=i;
cifra[i]%=10;
}
cifra[i]+=cifra[i-1];
cifra[i]%=10;
}
for(i=1;i<=t;i++)
{
in>>a;
len=strlen(a);
if(len==1)
out<<cifra[a[len-1]-'0']<<'\n';
else
out<<cifra[(a[len-2]-'0')*10+(a[len-1]-'0')]<<'\n';
}
}