#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(n==1) {
cout << "ne\n";
return 0;
}
cout << odg[f()] << '\n';
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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