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[wavic]

The first issue with your code is that you compare a string against an integer. The input() is always a string so you have to convert it to an integer.

Checking for an element in a list is simple: if element in list

In [1]: listA = [1, 3, 99, 58, 22, 77, 8, 2]

In [2]: x = int(input('Give me a number: '))
Give me a number: 14

In [3]: if x in listA:
   ...:     print(listA.index(x))
   ...: else:
   ...:     print(-1)
   ...:     
-1

In [4]: x = int(input('Give me a number: ')) # here the string returned from the input is converted to an integer
Give me a number: 22

In [5]: if x in listA: # pure English :D I love Python!
   ...:     print(listA.index(x)) # get the index of the first x in the list
   ...: else:
   ...:     print(-1)
   ...:     
4