P,Q,x,y = input().split()

rQ = Q[::-1]
ry = y[::-1]
x = int(x)
P = int(P)
rry = int(ry)
inv = pow(rry,P-2,P)
rrQ = int(rQ)
u = inv * (x-rrQ) % P
s = len(Q) + 1
now = pow(10,s,P)
while now % P != u:
    s += 1
    now = now * 10 % P
ans = str(ry) + '0' * (s-len(Q)) + str(rQ)
print(ans)