P, Q, x, y = map(int, input().split())
P = 90007
for i in range(1 << 30):
    N = str(y + i * Q)[::-1]
    if N[0] == '0':
        continue
    N = int(N)
    if N % P == 0:
        continue
    print(N, end="")
    N %= P
    break
while N != x:
    print("0", end="")
    N *= 10
    N %= P
print()