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#include<iostream>
#include<string>
#include<fstream>
using namespace std;
int result(string s) {
if(s.at(0) == s.at(s.length()-1))
return 1;
return 0;
}
int main() {
ifstream in("input.txt");
ofstream out("output.txt");
for(int ts = 0; ts < 100; ++ts) {
int _;
string s;
int size{};
for(int i = 0; i < 3; ++i) {
in >> _ >> s;
size += result(s);
}
out << size << '\n';
}
in.close();
out.close();
return 0;
}
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