#include <iostream>
#include <string>
using namespace std;
int main() {
string str;
int i;
int count;
count = 0;
getline(cin, str);
for (i = 0; i < str.length(); i++) {
if(str[i] >= 'a' && str[i] <= 'z')
count++;
}
cout << "It has " << count << " lowercases" << endl;
return 0;
}

输入：NOI2016 will be held in Mian Yang.

输出：It has 18 lowercases