sicily 1194 message blood之通过篇

#include
#include
#include
#include
using namespace std;

string trans(string name) {
int len = name.length();
string result;
for (int i = 0; i < len; i++) {
result.push_back(tolower(name[i]));
}
return result;
}
int main() {
int n, m;
while (cin >> n) {
if (n == 0) break; // The input is terminated by n=0.
cin >> m;
set message;
string name;
for (int i = 0; i < n; i++) {
cin >> name;
message.insert(trans(name));
} // end for

for (int j = 0; j < m; j++) {
string sender;
cin >> sender;
message.erase(trans(sender));
} // end for
cout << message.size() << endl; // 输出剩余没发过信息的朋友数
message.clear();
}
return 0;
}