이렇게하면됩니다.

arr = [[0 for col in range(11)] for row in range(10)]
#for i in arr:
#    for j in i:
#        print(j, end=' ')
#    print()
#print("x, y를 입력하세요.")
x, y = map(int, input().split())
arr[x][y] = "b"
for i in arr:
    for j in i:
        print(j, end=' ')
    print()