#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 998244353
void solve()
{
	ll n, q, sm = 0;
	cin >> n >> q;
	string s, t;
	cin >> s >> t;
	for (int i = 0; i < n; i++)
	{
		if (i & 1)
		{
			sm = sm - s[i] + t[i];
		}
		else
		{
			sm = sm + s[i] - t[i];
		}
	}
	if (sm % 26 == 0)
	{
		cout << "da" << '\n';
	}
	else
	{
		cout << "ne" << '\n';
	}
}
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int tests = 1;
	// cin >> tests;
	for (int i = 1; i <= tests; i++)
	{
		// cout << "Case #" << i << ": ";
		solve();
	}
	return 0;
}
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