#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, so;
int f() {
	int x=0;
	for(int i=0; i<n; i++) {
		int d=t[i]-s[i]+26;
		d%=26;
		x+=d;
	}
	return x%2==0;
}
signed main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> q;
	cin >> s >> t;
	so=s;
	if(q==0) {
		if(n==1) {
			cout << (s==t ? "da" : "ne") << '\n';
			return 0;
		}
		cout << odg[f()] << '\n';
		return 0;
	}
	// while(q--) {
	// 	int p;
	// 	char c;
	// 	cin >> p >> c;
	// 	so[p-1]=c;
	// 	s=so;
	// 	// cout << s << ' ' << t << '\n';
	// 	cout << odg[f()] << '\n';
	// }
	return 0;
}
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