#include <iostream>
using namespace std;
int palindrome (int nPar) {
int palNo = 0;
while (nPar > 0) {
if (nPar % 10 == nPar / 100 % 10 ) {
++palNo;
}
nPar /= 10;
}
return palNo;
}
int main() {
int n;
cin >> n;
cout << palindrome(n);
return 0;
}
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