TASK

Problem

#64

Given a four-digit non-negative integer `n`, print its thousands digit (the first decimal digit).

EXAMPLE

Example

Input

1234

Output

1

LIMITS

Constraints

1000 ≤ n ≤ 9999.

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LEARN Theory for this problem

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Repeated division by powers of 10 and `% 10` isolate decimal digits without converting the number to a string.

Connection to “First Digit of Four-Digit Number”: here, intermediate values are best kept in named variables so the formula stays readable and data types remain clear.

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NEED HELP? Hints

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['Extract the digits first, then combine or compare them.', 'After solving “First Digit of Four-Digit Number”, verify the algorithm on your own small example and on an allowed boundary case. Print only the required result with no extra text.']

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ANSWER Solution

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#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    int n;
    cin >> n;
    cout << n / 1000 << '\n';
    return 0;
}