#include<iostream.h>
void main()
{
int m,n,aux1=0,aux2=0,ok=0,a,b;
cout<<"m:"; cin>>m;
cout<<"n:"; cin>>n;
while(a!=0 && b!=0)
{
aux1=m%10;
m=m/10;
aux2=n%10;
n=n/10;
if(aux1!=0)
a=aux1;
if(aux2!=0)
b=aux2;
if(a==b)
{
ok++;
a=b=0;
}
if(m==n && aux1==aux2)
break;
}
if(ok!=0)
cout<<"da";
else
cout<<"nu";
}