POJ 3981 string replacement

I. Question Information
String replacement
Time Limit: 1000 MS Memory Limit: 65536 K
Total Submissions: 7501 Accepted: 3560
Description

Write a C program to replace all "you" in the string with "we"
Input

Input contains multiple rows of data

Each row of data is a string of no more than 1000 characters.
Data ends with EOF
Output

For each line of input, output the replaced string
Sample Input

You are what you do
Sample Output

We are what we do

Ii. Reference Code

[Cpp]
# Include <string>
# Include <iostream>
Using namespace std;
Int main ()
{
String str;
While (getline (cin, str ))
{
String: size_type pos = 0;
While (pos = str. find ("you", pos ))! = String: npos ){
Str. replace (pos ++, 3, "we ");
}
Cout <str <endl;
}
Return 0;
}