#include<iostream>
#include<string>
using namespace std;

int main()
{
	string s;
	int n, i;
	n = 0;
	while (cin>>s) {
		n++;
		for (i = 0; i < s.size()/2; i++) {
			if (s[i] != s[s.size()-i-1]) {
				n--;
				break;
			}
		}
	}
	cout<<n<<endl;
	return 0;
}