Given problem statment
A space explorer’s ship crashed on Mars! They send a series of SOS messages to Earth for help. 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.
solution in java
import java.util.*;
class Solution{
public static void main(String[] args){
int result = 0;
Scanner sc = new Scanner(System.in);
String message = sc.next();
int message_length = message.length();
for(int i = 0; i < message_length ; i+=3){
if(message.charAt(i) != 'S')
result++;
if(message.charAt(i+1) != 'O')
result++;
if(message.charAt(i+2) != 'S')
result++;
}
System.out.println(result);
sc.close();
}
}