problema 2214

#include <iostream>
using namespace std;
int main()
{
    int x,y,z,a,c1=0,c2=0,c3=0;
    cin>>x>>y;
    z=x;
    a=y;
    while ((x!=0) or (y!=0)){
        if (x!=0)
            c1++;
        if (y!=0)
            c2++;
        x=x/10;
        y=y/10;
    }
    if (c1==c2)
        cout<<"DA"<<endl;
    else if (c1!=c2){
        cout<<"NU"<<endl;
        return 0;
    }
while (z!=0){
    if (z%10==a%10)
        c3+=1;
    z=z/10;
    a=a/10;
}
cout<<c3;
}