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- #include <bits/stdc++.h>
- using namespace std;
- int main(){
- ios_base::sync_with_stdio(false);
- cin.tie(0);
- int k = 0;
- string s, t;
- cin >> s >> t;
- for(int i = 1; i <= min(s.size(), t.size()); i++)
- if (s[s.size() - i] == t[t.size() - i]) k++;
- cout << t.size() + s.size() - 2*k << endl;
- }
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