python

n = input().strip()
s = int(input())

if s >= len(n):
    print(0)
else:
    digits = list(n)
    for _ in range(s):
        i = 0
        while i < len(digits) - 1 and digits[i] <= digits[i + 1]:
            i += 1
        digits.pop(i)
  
    result = ''.join(digits).lstrip('0')
    print(result if result else '0')