Advanced · Exceptions · 189 of 264

Count the bad lines

Read lines until the line END. Add up the lines that are whole numbers; count the lines that are not.

Input: lines, the last one END. Output: Sum: <sum> on the first line, Invalid: <count> on the second.

Examples

Input

1
2
three
4
END

Output

Sum: 7
Invalid: 1

Input

END

Output

Sum: 0
Invalid: 0

Input

x
y
-5
END

Output

Sum: -5
Invalid: 2

One more test checks other inputs when you press Check.

Stuck? The idea behind exceptions

A try block runs code that might fail; its except catches the error and lets the program carry on, instead of stopping.

Catch the error you expect, by name: ValueError for int("abc"), ZeroDivisionError for dividing by 0.

for line in ["4", "x", "7"]:
    try:
        print(int(line) * 2)
    except ValueError:
        print("not a number")

Watch for: A bare except: hides every mistake, your own typing errors too. Name the error.