#include <iostream>
#include <string>
using namespace std;
int main() {
string s = "quick brown frog jumps over the lazy dog";
size_t start = -1;
int cnt = 3; // Word number three
do {
start = s.find(' ', start+1);
} while (start != string::npos && --cnt > 1);
size_t end = s.find(' ', start+1);
s.replace(start+1, end-start-1, "fox");
cout << s << endl;
return 0;
}
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