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#include <fstream>
#include <string.h>
using namespace std;
char s[105];
int t,v[105];
void init() {
for(int i=1;i<=100;i++) {
int p=1;
for(int j=1;j<=i;j++)
p=(p*i)%10;
v[i]=(v[i-1]+p)%10;
}
}
int main()
{
ifstream fin("cifra.in");
ofstream fout("cifra.out");
init();
fin>>t;
for(int i=0;i<t;i++) {
fin>>s;
int ns=strlen(s);
if(ns==1)
fout<<v[s[0]-'0']<<'\n';
else
fout<<v[s[ns-2]-'0']*10+v[s[ns-1]-'0']<<'\n';
}
return 0;
}