#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main(int argc, char const *argv[])
{
std::string s("a,b,c,d,e,f,");
std::replace_if(s.begin(), s.end(), [](char c){return c == ','; }, ' ');
cout << s << endl;
return 0;
}
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