#include <iostream>
#include <sstream>
using namespace std;
int main() {
int seconds=213213;
int hours = seconds / 3600;
int minutes = (seconds % 3600) / 60;
int t1 = seconds % 60;
int secs = t1 % 60;
string s = to_string(hours);
s+=":";
s+=to_string(minutes);
s+=":";
s+=to_string(secs);
cout<<s;
return 0;
}
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