#include <string>
#include <iostream>
#include <algorithm>

bool poli_test(std::string s){
    std::string buf = s;
    std::reverse(s.begin(), s.end());
    if (buf == s) return true;
    return false;
}

int main(){
    std::string s;
    std::getline(std::cin, s);

    s += ' ';

    int k = 0;

    while (true){
        while (s[0] == ' ') s.erase(0, 1);
        if (s.empty()) break;
        if (poli_test(s.substr(0, s.find(' ')))) k += 1;
        s.erase(0, s.find(' ') + 1);
    }
    std::cout << k;
    return 0;
}