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#include <stdio.h>

int main() {
    int array[5];
    int count1 = 0, count2 = 0;

    for (int i = 0; i < 5; i++) {
        scanf("%d", &array[i]);
    }

    for (int j = 1; j < 5; j++) {
        if (array[0] > array[4]) {
            if (array[j - 1] > array[j]) {
                count1++;
            }
        } else if (array[0] < array[4]) {
            if (array[j] > array[j - 1]) {
                count2++;
            }
        }
    }

    if (count1 == 4) {
        printf("D\n");
    } else if (count2 == 4) {
        printf("C\n");
    } else {
        printf("N\n");
    }

    return 0;
}