s=input()
s.split()
a=int(s[0])
b=int(s[1])
c=str(s[2])
d=str(input())

if d=="0":
    print(c*b)
    for counter in range(0,a-2):
        print(c+" "*b-2+c)
    print(c*b)
else:
    for i in range(0,a):
        print(c*b)