Mars Exploration

Letters in some of the SOS messages are altered by cosmic radiation during transmission.

Given the signal received by Earth as a string, s, determine how many letters of the SOS message have been changed by radiation.

Example

 

The original message was SOSSOS. Two of the message's characters were changed in transit.

Function Description

Complete the marsExploration function in the editor below.

marsExploration has the following parameter(s):

• string s: the string as received on Earth

Returns

• int: the number of letters changed during transmission

Input Format

There is one line of input: a single string s

int marsExploration(string s) {
    int changed = 0;
    for(int i = 0; i < s.size(); i = i + 3){
        if(s[i] != 'S'){
            changed++;
        }
        if(s[i+1] != 'O'){
            changed++;
        }
        if(s[i+2] != 'S'){
            changed++;
        }
    }
    return changed;
}