C$++$

Use sentinel values to exit cycles.

Assignment: Imagine you're a chef in a cooking show, and you're preparing ingredients for a recipe.

You need to keep track of the number of 'onions' you've prepared. Write a loop that reads strings from console input, representing different ingredients, e$.$g$.,$ 'onion', 'tomato', 'carrot', etc. The loop terminates when the string 'pepper' is read.

Be careful: ingredient names might have multiple words in them.

After the loop, your code should print out the total weight of the 'onions' prepared, where each 'onion' string read adds $50$ grams to the total weight.

Sample run

Input

wheat flour

tomato

mozzarella

onion

tuna

olives

onion

pepper

Output

Total weight of onions: $100$ grams

Note: Assume the string library has been already included. You need to only write the loop and declare any variable you need.