#challenge1
level #very_easy

Write a a script that asks a user to enter two integer and returns the addition of them

#rule

1 your should handle an exeception if the user input is invalid

#input_output_example

#ex1
input a number: 5
input another number: 4
the sum is 9
#ex2
input a number: abc
input another number: def
your input is invaild
#ex3
input a number: 1.2
input another number: 4.6
the sum is 5.8