30. Generate a number pyramid pattern.

Generate a number pyramid pattern.

Input Desc:
Given an integer R indicates number of rows.

Where 1<=R<=100

Output Description:
Print the number half pyramid pattern with the size R.

Sample Input :
4
Sample Output :
1234567
12345
123
1




def pattern(n):
    for i in range(n, 0, -1):
        l = []
        for j in range(1, (2*i)):
            l.append(str(j))
        print(''.join(l))
        
n = int(input())
pattern(n)