Ответ:

string=input()

count=string.count("!")

string=string.replace("!","")

print(string, count)

string=string.replace("а","абвгд")

print(string)

string=string+string[::-1]

print(string)

string=[string[i] for i in range(len(string)) if i%2==0]

print("".join(string))