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

#define SIZE 10


struct stack{
	float values[SIZE];
	int size;
};
void print(struct stack *s)
{
	if (s->size == 0){
		printf("no input\n");
		return;
	}
	for(int i = 0; i < s->size; 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;
	memset(&mystack,0,sizeof(struct stack));
	char x[100];

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

		if (*endptr == '\0') { // je cislo
			if(mystack.size >= SIZE) {
				printf("full stack\n");
				return 1;
			}	
		push(&mystack,num);
		}
		else if(strlen(x) == 1 && strchr("+-/*", x[0])) {
			if (mystack.size < 2){
				printf("not enough operands\n");
				return 0;
			}	
			float a = pop(&mystack);
			float b = pop(&mystack);
			float result =   0;
			switch(x[0]){
				case '+': result = b + a; break;
				case '-': result = b - a; break;
				case '*': result = b * a;break;
				case '/':
					  if(a == 0){
						printf("division by zero\n");
						return 0;
					  }
				result = b / a;
	       			break;			
			}
		push(&mystack,result);
		}
		else{
			printf("bad input\n");
			return 0;
		}
		print (&mystack);
	}
	printf("no input\n");
	if(mystack.size == 0){
		printf("no input\n");
	}		
	return 0;	
}