ex98

#include<iostream>
using namespace std;
int main()
{
    int n,m,ok=1;
    cin>>n;
    m=n%100;
    n=n/100;
    while(n>9)
     {
      if(n%100!=m)
       ok=0;
       n=n/100;

     }
    if(n!=m%10) ok=0;
   if(ok!=0)  cout<<"da";
     else cout<<"nu";
}