A,P,R=abs,print,range
a,b,c,d=map(int,input().split())
S=[0]*999
T=[0]*999
t,u=int(A(a)<A(b)),int(A(c)<A(d))
if 1-t:a,b=b,a
if 1-u:c,d=d,c
i=j=0
while a*b:S[i],a,b,t,i=[1+t,-(b//a)],b%a,a,1-t,i+1
while c*d:T[j],c,d,u,j=[1+u,d//c],d%c,c,1-u,j+1
if b-d:T[j],T[j+1],d,u,j=[2-u,1],[1+u,-1],-d,1-u,j+2
if b-d:P(-1),exit(0)
if t-u:T[j],T[j+1],j=[2-u,-1],[1+u,1],j+2
P(i+j)
for k in R(i):P(*S[k])
for k in R(j):P(*T[j-1-k])