A. Wrong Subtraction

Codeforces

IDCF977A

Time1000ms

Memory256MB

Difficulty—

implementation

Little girl Tanya is learning how to decrease a number by one, but she does it wrong with a number consisting of two or more digits. Tanya subtracts one from a number by the following algorithm: * if the last digit of the number is non-zero, she decreases the number by one; * if the last digit of the number is zero, she divides the number by 10 (i.e. removes the last digit). You are given an integer number $n$. Tanya will subtract one from it $k$ times. Your task is to print the result after all $k$ subtractions. It is guaranteed that the result will be positive integer number. ## Input The first line of the input contains two integer numbers $n$ and $k$ ($2 \le n \le 10^9$, $1 \le k \le 50$) — the number from which Tanya will subtract and the number of subtractions correspondingly. ## Output Print one integer number — the result of the decreasing $n$ by one $k$ times. It is guaranteed that the result will be positive integer number. [samples] ## Note The first example corresponds to the following sequence: $512 \rightarrow 511 \rightarrow 510 \rightarrow 51 \rightarrow 50$.

Samples

Input #1

512 4

Output #1

Input #2

1000000000 9

Output #2

API Response (JSON)

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    "name": "A. Wrong Subtraction",
    "description": {
      "content": "Little girl Tanya is learning how to decrease a number by one, but she does it wrong with a number consisting of two or more digits. Tanya subtracts one from a number by the following algorithm: *   ",
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    },
    "platform": "Codeforces",
    "limit": {
      "time_limit": 1000,
      "memory_limit": 262144
    },
    "difficulty": "None",
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    {
      "statement_type": "Markdown",
      "content": "Little girl Tanya is learning how to decrease a number by one, but she does it wrong with a number consisting of two or more digits. Tanya subtracts one from a number by the following algorithm:\n\n*   ...",
      "is_translate": false,
      "language": "English"
    }
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}

Full JSON Raw Segments