How to check how many times character from string appears?

I want to count how many times each letter from params appears in this string. What am I doing wrong?

function solution(word) {
    let temp = {}
    for(const c of word) {
      temp[c]++;
      console.log(temp[c])
  }
  
}

solution("PAPAYA")

It should output me numbers below for each letter, but i keep getting NaN

1 // P appeared once
1 // A appeared once
2 // P appeared second time
2 // A appeaed second time
1 // Y Once
3 // A appeared third time

so it should look like

{
  A: 3,
  P: 2,
  Y: 1
}

>Solution :

Here is an easy solution without changing your code to much

function solution(word) {
    let temp = {}
    for(const c of word) {
      if (temp[c] === undefined)
        temp[c] = 1;
       else temp[c]++;
  }
  console.log(temp)
}

solution("PAPAYA")