#include<bits/stdc++.h>
using namespace std;
int main(){
    char a; 
    cin >> a;
	cout << "  " << a << endl;
	cout << " " << a << a << a <<endl;
	cout << a << a << a << a << a << endl;
	return 0;
}

！ 我就是一个分号错了 写成小数点了

1. symbol queue: char;
2. ''n '' equal to give some empty;
3. "a"is a variable, "cin">>conjunct this variable;
4. "endl" can swap a paragraph.