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- #include <bits/stdc++.h>
- #define endl '\n'
- using ll = long long int;
- int main() {
- int n, m, k;
- std::string s;
- std::cin >> n >> k >> s;
- char &c = s[k-1];
- c = tolower(c);
- std::cout << s << endl;
- }
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