#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e9;
const int N = 1e5+1;
void solve() {
int n,q;
cin >> n >> q;
string s,t;
cin >> s >> t;
auto eval =[&]() -> bool {
int sm1 = 0,sm2 = 0;
for (int i = 0;i<n;i+=2) sm1+=s[i];
for (int i = 1;i<n;i+=2) sm1-=s[i];
sm1+=20000000000;
for (int i = 0;i<n;i+=2) sm2+=t[i];
for (int i = 1;i<n;i+=2) sm2-=t[i];
sm2+=20000000000;
return sm1 == sm2;
};
cout << (eval()?"da\n":"ne\n");
while (q--) {
int p;
char c;
cin >> p >> c;
s[p-1] = c;
cout << (eval()?"da\n":"ne\n");
}
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0);
#ifdef Dodi
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
#endif
int t = 1;
//cin >> t;
while (t --> 0) solve();
}
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