#include <stdio.h>
#include <string.h>

int divide(char part[4]) {
    int length = 0;
    for (int i=0; i < sizeof(part)-1; i++) {
        if (part[i] != '\0') length++;
    }
    return length;
}

void separate(char org[2][12], char part[2][3][4], int length[2][3]) {

    for (int i = 0; i < 2; i++) {
        char* tp = strtok(org[i], ".");
        sprintf(part[i][0],"%s",tp);

        int count = 0;
        while (tp != NULL) {
            tp = strtok(NULL, ".");
            if (tp != NULL) {
                if (count++ == 0) sprintf(part[i][1], "%s", tp);
                else              sprintf(part[i][2], "%s", tp);
            }
        }
        for (int j=0; j<3; j++) length[i][j] = divide(part[i][j]);
    }
}

void bigger(char part[2][3][4], int length[2][3]) {
    for (int i=0; i < 3; i++) {
        int sum[2] = {0,0};

        if (length[0][i] > length[1][i]) {
            printf("YES\n");
            return;
        } else if (length[0][i] == length[1][i]) {
            for (int j =0; j < length[0][i]; j++) {
                if ((int) part[0][i][j] > (int) part[1][i][j]) {
                    printf("YES\n");
                    return;
                } else if ((int) part[0][i][j] < (int) part[1][i][j]) {
                    printf("NO\n");
                    return;
                }
            }
        } else {
            printf("NO\n");
            return;
        }
    }
    printf("YES\n"); // 全て等しいとき
}

int main() {
    int  sum[2] = {0,0};
    int  length[2][3] = {0};
    char version[2][12];
    char part[2][3][4]= {0};

    scanf("%s %s",&version[0], &version[1]);
    separate(version, part, length);
    bigger(part, length);
    return 0;
}