import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String time = in.next();
if(time.contains("AM")){
time = time.replace("AM", "");
String[] timeArr = time.split(":");
if(timeArr[0].equals("12")){
timeArr[0] = "00";
}
time = timeArr[0]+":"+timeArr[1]+":"+timeArr[2];
}
else if(time.contains("PM")){
time = time.replace("PM", "");
String[] timeArr = time.split(":");
if(!timeArr[0].equals("12")){
timeArr[0] = Integer.toString(Integer.parseInt(timeArr[0])+12);
}
time = timeArr[0]+":"+timeArr[1]+":"+timeArr[2];
}
System.out.println(time);
}
}
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String time = in.next();
if(time.contains("AM")){
time = time.replace("AM", "");
String[] timeArr = time.split(":");
if(timeArr[0].equals("12")){
timeArr[0] = "00";
}
time = timeArr[0]+":"+timeArr[1]+":"+timeArr[2];
}
else if(time.contains("PM")){
time = time.replace("PM", "");
String[] timeArr = time.split(":");
if(!timeArr[0].equals("12")){
timeArr[0] = Integer.toString(Integer.parseInt(timeArr[0])+12);
}
time = timeArr[0]+":"+timeArr[1]+":"+timeArr[2];
}
System.out.println(time);
}
}
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