import random
n, m = map(int, input().split())
a = list()
for i in range(n):
u = list()
for j in range(m):
u.append(random.randint(1,1000))
a.append(u)
k, l = map(int, input().split())
print("before changing: ")
for i in range(n):
print(*a[i], sep=" ")
for i in range(m):
t = a[k-1][i]
a[k-1][i] = a[l-1][i]
a[l-1][i] = t
print("after changing: ")
for i in range(n):
print(*a[i], sep=" ")