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#include<fstream>
#include<cstring>
using namespace std;
#define dim 30001
struct tip{char nr[101];unsigned short int d;}v[dim];
int power(int x,int y)
{
int i,p=1;
for(i=1;i<=y;i++)
p*=x;
return p;
}
int main()
{
ifstream f("cifra.in");
ofstream g("cifra.out");
int i,k=0,k1,j,t,s=0;
f>>t;
for(i=1;i<=t;i++)
{
f>>v[++k].nr; k1=0;
v[k].d=v[k].nr[strlen(v[k].nr)-1]-'0';
}
f.close();
for(i=1;i<=k;i++)
{
s+=power(v[i].d,i);
g<<s%10<<'\n';
}
g.close();
return 0;
}