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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int q, v[10], val, res;
char cf[105];
int main()
{
v[0]=0;v[1]=1;v[2]=4;v[3]=7;v[4]=6;v[5]=5;v[6]=6;v[7]=3;v[8]=6;v[9]=9;
fin>>q;
fin.get();
while(q--)
{
res=0;
fin.getline(cf,102);
int i=0;
while(cf[i]!=NULL)
{
val=int(cf[i]-'0');
i++;
}
for(int i=1; i<=val; i++)
res=res+v[i];
fout<<res%10<<'\n';
}
return 0;
}