#include <bits/stdc++.h>
using namespace std;
using ll=long long;
#define F first
#define S second
#define sz(x) int(x.size())
string odg[2]={"ne", "da"};
int n, q;
string s, t;
int f() {
	for(int i=0; i<n-1; i++) {
		int d=t[i]-s[i]+26;
		d%=26;
		s[i]-='a';
		s[i]+=d;
		s[i]%=26;
		s[i]+='a';
		s[i+1]-='a';
		s[i+1]+=d;
		s[i+1]%=26;
		s[i+1]+='a';
	}
	return s==t;
}
signed main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> q;
	cin >> s >> t;
	if(q==0) {
		cout << odg[f()] << '\n';
	}
	return 0;
}
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