C++ :

#include<bits/stdc++.h>
using namespace std;
int main()
{
	string st[8]={"apples","bananas","peaches","cherries","pears","oranges","strawberries"};
	string s;
	while(getline(cin,s))
	{
		int pos=-1,t=0;
		for(int i=0;i<7;i++)
		{
			pos=s.find(st[i]);
			if(pos>=0) 
			{
				s.replace(pos,st[i].size(),"fruit");
				t=1;
				cout<<s<<endl;
				break;
			}
		}	
		if(t==0) cout<<"You must not enjoy fruit."<<endl;		
	}

	return 0;
}