Problem Description
Write a program to display a bar chart of the input data.
[Input form]
Read multiple (not more than 30) positive integers (greater than 0 and less than or equal to 20) from standard input, ending with -1. Separate each integer with a space.
【Output form】
The histogram of each number is displayed on the screen in turn (the "*" character represents the histogram, and the blank space is represented by space characters).
【Sample input】
5 12 8 6 1 4 -1
[Sample output]
*
*
*
*
**
**
***
****
**** *
**** *
**** *
******
[Sample description]
A total of 6 positive integers were entered, namely: 5 12 8 6 1 4. Therefore, the leftmost column should output 5 bars denoted by "*", followed by 12, 8, 6, 1, and 4 bars denoted by "*".