import sys

a+list(map(int,input().split))

n=a[0]

m=a[1]

candidate=[]

for i in range(N):

         row=list(map(intinput().split()))

         candidatr.append(max(rows))

print(sum(candidate))

times=0

for i in candidate:

   if sum(candidate)%i==0:

       print(i<end=" ")

       time+=1

if time==0:

   print(-1)

eles:

   print()