ABC051_A

文字列の置換
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#include<iostream>
#include<string>
using namespace std;

//  文字列を置換する
std::string Replace(std::string String, std::string From, std::string To )
{
    std::string::size_type  Pos( String.find( From ) );

    while( Pos != std::string::npos )
    {
        String.replace( Pos, From.length(), To );
        Pos = String.find( From, Pos + To.length() );//さっきまで探してた位置以降のFromを探す
    }

    return String;
}

int main()
{
    string s;
    cin >> s;
    s = Replace(s,","," ");
    cout<<s<<endl;
    return 0;
}