Python program to increment the elements of list

Write a python program to increment the elements of a list with a number.

mylist=eval(input("Enter any List"))
print("Before increment list is ",mylist)
a=0
for b in mylist:
    mylist[a]=b+1
    a=a+1
print("After increment list is ",mylist)

Enter any List[5,7,8,4]

Before increment list is  [5, 7, 8, 4]

After increment list is  [6, 8, 9, 5]