#include <stdio.h>
#include <string.h>
#include <stdlib.h>


#define SIZE 10


struct stack{
	float values[SIZE];
	int size;
};
void print(struct stack *s)
{
	for(int i = 0; i < s ->values[i]){
		printf("%.2f ", s->values[i]);		
	}
	printf("\n");
}
void push(struct stack *s, float value)
{
    assert(s->size < SIZE); 
    s->values[s->size] = value;
    s->size += 1;
}
float pop(struct stack *s)
{
    assert(s->size > 0);
    s->size -= 1;
    return s->values[s->size];
}
int main(){
	struct stack mystack;
	mamset(&mystack,0,sizeof(struct stack));
	char x[100];

	while(fgets(x, 100, stdin)){
		x[strcspn(x, "\n")] = 0;
		if (strlen() == 0) continue;
		char *endptr;
		float num = strtof(x, &endptr);

		if (*endptr == "\0") { // je cislo
			if(mystack.size >= SIZE) {
				fprintf(stderr," plne \n");
				return 1;
			}	
		push(&mystack,num);
		}
		else if(stlen(x) == 1 && strchr("+-/", x[0])) {
			if (mystack.size < 2){
				fprint(stderr, "malo cisel \n");
				return 1;
			}	
			float a = pop(&mystack);
			float b = pop(&mystack);
			float result =   0;
			switch(x[0]){
				case '+': result = a + b; break;
				case '-': result = a - b; break;
				case '*': result = a * b;break;
				case '/':
					  if(b == 0){
						fprintf(strderr, "nule pr ideleni \n");
						return 1;
					  }
				resut = a / b;
	       			break;			
			}
		push(&mystak,result);
		}
		else{
			fprintf(stderr, " zly vstup \n");
			return 1;
		}
		print (&mystack);
	}
	
	return 0;	
}