import java.util.ArrayList;
import java.util.Arrays;

public class Main2 {

    char[] timeS = new char[6];
    char[] timeT = new char[6];
    public static void main(String[] args) {

        char[] S = new char[]{'2', '2', ':', '2', '2', ':', '2', '1',};
        char[] T = new char[]{'2', '2', ':', '2', '2', ':', '2', '3',};

        Main2 myApp = new Main2();
        System.out.println(myApp.solution(S, T));

    }
    int solution(char[] S, char[] T) {
        // Hours for S
        timeS[0] = S[0];
        timeS[1] = S[1];

        // Hours for S
        timeS[2] = S[3];
        timeS[3] = S[4];

        // Hours for S
        timeS[4] = S[6];
        timeS[5] = S[7];

        // Hours for T
        timeT[0] = T[0];
        timeT[1] = T[1];

        // Minutes for T
        timeT[2] = T[3];
        timeT[3] = T[4];

        // Seconds for T
        timeT[4] = T[6];
        timeT[5] = T[7];


        int interestingCount = 0;

        boolean exit = false;

        while (!Arrays.equals(timeS, timeT)) {
            increaseTime(timeS);
            interestingCount = interestingCount + checkInteresting(timeS);
        }
        return interestingCount;
    }

    private int checkInteresting(char[] arr) {
        ArrayList<Character> charArray = new ArrayList<>();
        for (int i = 0; i < arr.length; i++) {
            if (!charArray.contains(arr[i])) {
                charArray.add(arr[i]);
            }
        }
        if (charArray.size() > 2) {
            return 0;
        } else {
            return 1;
        }
    }

    private void increaseTime(char[] arr) {
        /*
         ASCII 48 is 0
         ASCII 49 is 1
         ASCII 50 is 2
         ASCII 51 is 3
         ASCII 52 is 4
         ASCII 53 is 5
         ASCII 54 is 6
         ASCII 55 is 7
         ASCII 56 is 8
         ASCII 57 is 9
         ASCII 58 is :
         */

        arr[5]++;
        if (arr[5] == 58) {
            arr[5] = 48;
            arr[4]++;

            if (arr[4] == 55) {
                arr[4] = 48;
                arr[3]++;

                if (arr[3] == 58) {
                    arr[3] = 48;
                    arr[2]++;

                    if (arr[2] == 55) {
                        arr[2] = 48;
                        arr[1]++;

                        if (arr[1] == 52 && arr[0] == 50) {
                            arr[0] = 0; // overflow
                        } else if (arr[1] == 58 && (arr[0] == 48 || arr[0] == 49)) {
                            arr[0]++;
                        }
                    }
                }
            }
        }
    }
}