#include <stdio.h>
#include <stdlib.h>

const int s[] = { 4, 6, 8, 10, 12, 20 };

main(int argc, char **argv) {
    int min, max, i, x;

    int dice = sizeof(s) / sizeof(*s);

    if (argc != 2) {
        fprintf(stderr, "usage: %s <range>\n", argv[0]);
        exit(1);
    }

    if (sscanf(argv[1], "%d-%d", &min, &max) != 2) {
        fprintf(stderr, "error: malformed range: expecting 'x-y'\n");
        exit(1);
    }

    for (i = 0; i < dice; ++i)
        if ((max - min) % (s[i] - 1) == 0) {
            x = (max - min) / (s[i] - 1); 
            printf(min == x ? "%dd%d\n" : "%dd%d%s%d\n", x, s[i], x > min ? "-" : "+", abs(min - x));
        }
}