import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
 
public class Main {
	public static void main(String[] args) {
		// Test
		System.out.println(timeConversion("12:05:39AM"));
	}
 
	public static String timeConversion(String s) {
		DateTimeFormatter dtfInput = DateTimeFormatter.ofPattern("h:m:sa", Locale.ENGLISH);
		LocalTime time = LocalTime.parse(s, dtfInput);
 
		DateTimeFormatter dtfOutput = DateTimeFormatter.ofPattern("HH:mm:ss", Locale.ENGLISH);
		return time.format(dtfOutput);
	}
}

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