#include <assert.h>
#include <limits.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* readline();

/*
 * Complete the timeConversion function below.
 */

/*
 * Please either make the string static or allocate on the heap. For example,
 * static char str[] = "hello world";
 * return str;
 *
 * OR
 *
 * char* str = "hello world";
 * return str;
 *
 */
char* timeConversion(char* s) {
    int lastchar=strlen(s)-1;//position of last char in the array
    char* pplast=s+(lastchar-1);//pointer to previous of last char so can check (A||P)
    char* fDigit=s;char* sDigit=fDigit+1;//first and second digit
    int ifDigit=*fDigit-'0';
    int isDigit=*sDigit-'0';
    int concat=(ifDigit*10+isDigit);
    if ((*pplast=='P'&&concat!=12)||(*pplast=='A'&&concat==12)){
        int plus=(concat==12)?-12:12;
        int sum;
        sum=concat+plus;
        int f,s;
        f=(sum/10);
        s=(sum%10);
        *fDigit=f+'0';
        *sDigit=s+'0';
    }
    *pplast='\0';
    return s;
}
int main()
{
    FILE* fptr = fopen(getenv("OUTPUT_PATH"), "w");

    char* s = readline();

    char* result = timeConversion(s);

    fprintf(fptr, "%s\n", result);

    fclose(fptr);

    return 0;
}

char* readline() {
    size_t alloc_length = 1024;
    size_t data_length = 0;
    char* data = malloc(alloc_length);

    while (true) {
        char* cursor = data + data_length;
        char* line = fgets(cursor, alloc_length - data_length, stdin);

        if (!line) { break; }

        data_length += strlen(cursor);

        if (data_length < alloc_length - 1 || data[data_length - 1] == '\n') { break; }

        size_t new_length = alloc_length << 1;
        data = realloc(data, new_length);

        if (!data) { break; }

        alloc_length = new_length;
    }

    if (data[data_length - 1] == '\n') {
        data[data_length - 1] = '\0';
    }

    data = realloc(data, data_length);

    return data;
}