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#include <cstdio>
#include <cstring>
using namespace std;
int v[102];
char s[105];
int main()
{
freopen("cifra.in","r",stdin);
freopen("cifra.out","w",stdout);
int t,a,l=0;
scanf("%d",&t);
v[0]=0;
for(int i=1;i<=100;i++)
{
a=1;
for(int j=1;j<=i;j++)
{
a=a*i;
a=a%10;
}
l=l+a;
l=l%10;
v[i]=l;
}
for(int i=1;i<=t;i++)
{
scanf("%s",s);
l=strlen(s);
if(l==1) a=s[0]-'0';
else a=(s[l-2]-'0')*10+(s[l-1]-'0');
printf("%d\n",v[a]);
}
return 0;
}