[getting started] intercepting strings

describe

Enter a string and an integer k , Before intercepting the string k Characters and output

Input description

1. Enter the string to be intercepted
2. Enter a positive integer k, Represents the intercepted length

Output description

The truncated string

Example 1

Input ：abABCcDEF
6
Output ：abABCc

Example 2

Input ：bdxPKBhih
6
Output ：bdxPKB

<?php

fscanf(STDIN, "%s", $a);
fscanf(STDIN, "%d",$k);

echo substr($a,0,$k);