`1)`

def ham(A, x):
    B = []
    for i in A:
        if i >= x:
            B.append(i)
    return B

`2)`

A = [int(x) for x in input().split()]
print("a.", A)
B = []
for i in A:
    if i > 0:
        B.append(i)
print("b.", B)
C = []
for i in A:
    if i % 2 == 0:
        C.append(i)
print("c.", C)

`3)`

a = int(input("a = "))
b = int(input("b = "))
t = a
a = b
b = t
print("a =", a)
print("b =", b)