题解

#include<bits/stdc++.h>
using namespace std;
int main() {
	string s;
    getline(cin, s);
    int cnt = 0;
    for (int i = 0; i <= s.size(); i++) {
        if(s[i] == '\0') {
            if(s[i - 1] == ' ') break;
            else {
                cout << cnt;
                break;
            }
        }
        if(s[i] != ' ')cnt++;
        else if(s[i] == ' ' && s[i + 1] != ' ') {
            cout << cnt;
            if(i < s.size() - 1) cout << ",";
            cnt = 0;
        }
    }
	return 0;
}