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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int n,nr,x[101];
char a[101];
void gen()
{
for(int i=0;i<=100;i++)
{
x[i]=i%10;
for(int j=1;j<i;j++)
x[i]=(x[i]*i%10)%10;
}
}
int main()
{
gen
f>>n;
f.get();
for(int i=1;i<=n;i++ )
{
f.getline(a,101);
if (strlen(a)==1) nr=a[strlen(a)-1]-'0';
else
nr=(a[strlen(a)-2]-'0')*10+(a[strlen(a)-1]-'0');
if (nr==0) g<<x[100]<<'\n';
else
g<<x[nr]<<'\n';
}
return 0;
}