#include <iostream>
#include <string>
using namespace std;

string remove(string s1, string s2)
// post: removes first occurrence of s2 from s1 and returns the resulting string. 
// Returns s1 if s2 does not occur any.
{
	unsigned int location;

	location = s1.find(s2);
	if (location != string::npos)
	{
		return s1.substr(0, location) + s1.substr(location+s2.length(), s1.length());
	}
	return s1;
}

int main()
{
	string s = "Today is Monday", stringtoremove;

	cout << "string is " << s << endl;
	cout << "enter the substring to remove: ";
	cin >> stringtoremove;

	cout << remove(s, stringtoremove) << endl;

	return 0;
}