Given 2 numbers N and K followed by N elements,print the number of repetition of K otherwise print '-1'

Given 2 numbers N and K followed by N elements,print the number of repetition of K otherwise print '-1' if the element not found.
Sample Testcase :
INPUT
6 2
1 2 3 5 7 8
OUTPUT
0

const readline = require('readline');
const inp = readline.createInterface({
  input: process.stdin
});
const userInput = [];
inp.on("line", (data) => {
userInput.push(data);
});
inp.on("close", () =>
{var a = (userInput[0]);
var inp = a.split(' ');
var k = inp[1]
 var b = (userInput[1]);
 var arr = b.split(" ")
 var flag =0
 for(i=0;i<arr.length;i++)
 {if(arr[i]==k)
 flag++}
  if(flag>1)
 console.log(flag)
 else if (flag==1)
 console.log(0)
 else if(flag==0)
 console.log(-1)
 });

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