#include <iostream>
using namespace std;

void next_step (int* const a, int* const b, char const * const msg) {
    (*a)--; (*b)--; cout << msg << '-' << endl;
}

int main() {
    int A, B, C, D, E, F, G, H;
    cin >> A >> B >> C >> D >> E >> F >> G >> H;

    if ((E + D + B + G) - (A + C + F + H) != 0) {
        cout << "IMPOSSIBLE" << endl;
        return 0;
    }

    while (E + D + B + G > 0) {

        if (E > 0) {
            if (A > 0) next_step(&E, &A, "EA");
            else if (F > 0) next_step(&E, &F, "EF");
            else if (H > 0)  next_step(&E, &H, "EH");
            else if (C > 0) { E--; C--; cout << "FB+" << endl << "EF-" << endl << "CB-" << endl; }
        }
        if (D > 0) {
            if (A > 0) next_step(&D, &A, "DA");
            else if (C > 0) next_step(&D, &C, "DC");
            else if (H > 0) next_step(&D, &H, "DH");
            else if (F > 0) { D--; F--; cout << "EA+" << endl << "FE-" << endl << "DA-" << endl; }
        }
        if (B > 0) {
            if (A > 0) next_step(&B, &A, "BA");
            else if (C > 0) next_step(&B, &C, "BC");
            else if (F > 0) next_step(&B, &F, "BF");
            else if (H > 0) { B--; H--; cout << "EA+" << endl << "BA-" << endl << "EH-" << endl; }
        }
        if (G > 0) {
            if (H > 0) next_step(&G, &H, "GH");
            else if (C > 0) next_step(&G, &C, "GC");
            else if (F > 0) next_step(&G, &F, "GF");
            else if (A > 0) { G--; A--; cout << "FB+" << endl << "GF-" << endl << "AB-" << endl; }
        }
    }

    return 0;
}