#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define int long long
const int N=3e5+5;
const int P=1e9+7;
signed main(){
int n,q;
cin>>n>>q;
string s,t;
cin>>s>>t;
int h=0;
for(int i=0;i<n-1;i++){
int c=(t[i]-s[i]+26)%26;
int a= s[i]-'a';
a= (a+c)%26;
s[i]=a+'a';
a= s[i+1]-'a';
a= (a+c)%26;
s[i+1]=a+'a';
}
if(s==t){
cout<<"da";
}
else{
cout<<"ne";
}
}
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