#include <iostream>
#include <vector>

using namespace std;

int main(){
	cout << "请输入一个算式，包含加减乘除乘方括号:" << endl;
	string s;
	cin >> s;
	vector<double> num;
	vector<char> symbol;

	for (auto x:s){
		if((x>47)&&(x<58)){
			if(symbol.begin()==symbol.end()){//判断字符栈是否为空
				num.push_back(x-'0');
			}elif(*(symbol.end()-1)=='46'){
				*(num.end()-1)=atof((to_string(*num.end()-1)).c_str()+x);
			}
		}
	}

	for (double a:num){
		cout << a << endl;
	}

	return 0;
}