Palindromi

#include <iostream>
#include <cmath>

using namespace std;

int main(){
    string str;
    int laskuri=0;
    //Luetaan syöte
    cin >> str;
    //Selvitetaan syötteen merkkimäärä
    int p=str.size();
    //cout << p << endl;
    int a=0;
    int b=p-1;
    // Syöte on parillinen

    cout <<"a"<< a << " b " << b << endl;
    for(int i=0; i<=(ceil(p/2)-1); i+=1){
            if(str[a]!=str[b]){
                laskuri+=1;   
            }
            a+=1;
            b-=1; 
            //cout << "i "<< i << endl;
            //cout << a << " " << b << endl;
    }
    cout << laskuri << endl;
    return 0;     
} 

Test 1 (public)

Verdict: WRONG ANSWER

Test 2 (public)

Verdict: WRONG ANSWER

Test 3 (public)

Verdict: WRONG ANSWER

Test 4 (public)

Verdict: WRONG ANSWER

Test 5 (public)

Verdict: WRONG ANSWER

Test 6 (public)

Verdict: WRONG ANSWER

Test 7 (public)

Verdict: WRONG ANSWER

Test 8 (public)

Verdict: WRONG ANSWER

Test 9 (public)

Verdict: WRONG ANSWER

Test 10 (public)

Verdict: WRONG ANSWER