cifre001

#include <iostream>
using namespace std;
int n1,n2,nce;

int main()
{
    cin>>n1>>n2;
    while(n1&&n2)
    {
        if(n1%10==n2%10)
            ++nce;
        n1/=10;
        n2/=10;
    }
    if(n1||n2)
        cout<<"NU";
    else
        cout<<"DA\n"<<nce;
    return 0;
}