This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define F first
#define S second
#define all(v) v.begin(),v.end()
typedef pair<int,int> ii;
typedef pair<int,ii> iii;
typedef vector<int> vi;
typedef vector<char> vc;
typedef vector<bool> vb;
typedef vector<ii> vii;
typedef set<int> si;
typedef map<int,int> mii;
const int INF = 2e5 + 100;
int n,q;
string a,b;
int32_t main(){
		
	cin >> n >> q >> a >> b;
	vi differ;
	for (int i = 0; i < n; i++){
		int step = 0;
		char x = a[i];
		while (x != b[i]){
			step++; x++;
			if (x > 'z') x = 'a';
		}
	//	int tmp = b[i] - a[i];
	//	if (tmp < 0) tmp += 26;
		differ.pb(step);
		//cout << step << " ";
	}
	bool c = true;
	for (int i = 0; i < n-1; i++){
		if (differ[i] > differ[i+1]){
			c = false;
			break;
		}
		else {
			differ[i+1] -= differ[i];
			differ[i] = 0;
		}
	}
	if (c) cout << "da" << endl;
	else cout << "ne" << endl;
	
	return 0;
}	
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