为什么第六个点$WA$

#include<iostream>
#include<string>
using namespace std;
int main() {
	string s;
	getline(cin, s);
	for (int i = 0;i < s.size();i++) {
		if (s[i] == '+') {
			cout << " tighten ";
		}
		else if (s[i] == '-') {
			cout << " loosen ";
		}
		else if (s[i] >= '0' && s[i] <= '9') {
			cout << s[i] << '\n';
		}
		else {
			cout << s[i];
		}
	}
	return 0;
}