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#include<fstream>
#include<math.h>
#include<string.h>
using namespace std;
int t[101];
int main()
{
int n=100;
int b,o=0;
char s[120]="";
int l;
for(int i=1;i<=n;i++)
{
b=1;
for(int j=1;j<=i;++j)
b = (i*b)%10;
o+=b;
t[i]=o%10;
}
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>n;
for(int i=0;i<n;i++)
{
f>>s;
l=s[strlen(s)-1]-'0';
if(strlen(s)>1)l+=10*(s[strlen(s)-2]-'0');
g<<t[l]<<endl;
}
return 0;
}