#include <stdio.h>
#include<stdlib.h>
#include <string.h>
#include <assert.h>
#define STACK_SIZE 10000

struct stack{
    float values[STACK_SIZE];
    int size;
};
struct stack mystack;

void push_stack(struct stack* stack, float value){
assert(stack->size < STACK_SIZE); 
stack->values[stack->size] = value;
stack->size += 1;
}
float pop_stack(struct stack* stack){
  assert(stack->size > 0);
float value = stack->values[stack->size-1];
stack->size -= 1;
return value;
}
void print_stack(struct stack* stack){
    for(int i = 0; i < stack->size; i++)
        printf("%.2f ", stack->values[i]);
    printf("\n");
}


void process_operations(struct stack* stack) {
    char line[STACK_SIZE];
    int could_read = 0;

    while (fgets(line, sizeof(line), stdin)) {
        could_read= 1;
        line[strcspn(line, "\n")] = '\0';
        if (line == '\0')
        {printf("no input\n");
        return;

        }
        

        if ((strcmp(line, "+") == 0 || strcmp(line, "-") == 0 ||
             strcmp(line, "*") == 0 || strcmp(line, "/") == 0)) {
            if (stack->size >= 2) {
                float b = pop_stack(stack);
                float a = pop_stack(stack);
                float res = (line[0] == '+') ? a + b :
                            (line[0] == '-') ? a - b :
                            (line[0] == '*') ? a * b :
                            (line[0] == '/') ? a / b : 0;
                push_stack(stack, res);
                print_stack(stack);
            } else {
                printf("bad input\n");
                return;
            }
        } else {
            char *endptr;
            float val = strtof(line, &endptr);
            if (endptr == line) { 
                printf("no input\n");
                return;
            }
            push_stack(stack, val);
            print_stack(stack);
        }
    }

    if (!could_read) {
        printf("no input\n");
    }
}
int main(void){
    memset(&mystack,0,sizeof(struct stack));
    process_operations(&mystack);
}