python1

a = input()

def zadacha__ABab(a) :
    text = ""
    count = 0

    for i in range(len(a)):
        if a[i]== "a" :
            text = text + "b"
            count += 1

        elif a[i] == "A":
            text = text + "B"
            count += 1

        elif a[i] == "b":
            text = text + "a"
            count += 1

        elif a[i]=="B":
            text = text + "A"
            count += 1

        elif a[i] == "c":
            text = text + "с"

        elif a[i] == "C":
            text = text + "C"

        else:
            pass
    #text - преобразованный текст
    #count - количество замен
    print(text)
    print(count)


zadacha__ABab(a)