#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>

#define SIZE 50

int currentlyInBuffer = 0;

bool calculatorLogic(char buffer[SIZE][SIZE]){
    if(isdigit(buffer[currentlyInBuffer][0])){
        if(currentlyInBuffer == 9) {
            printf("full stack\n");
            return false;
        }
        for(int i = 0; i <= currentlyInBuffer; i++){
            if(i == currentlyInBuffer)
                printf("%0.2f \n", roundf(atof(buffer[i])*100)/100);
            else
                printf("%0.2f ", roundf(atof(buffer[i])*100)/100);
        }
        return true;
    }
    else if(strchr("+-/*", buffer[currentlyInBuffer][0]) != NULL){
        if(currentlyInBuffer < 2){
            printf("not enough operands\n");
            return false;
        }

        double temporaryDecimal = 0;

        switch(buffer[currentlyInBuffer][0]){
            case '+':
                temporaryDecimal = round((atof(buffer[currentlyInBuffer-2]) + atof(buffer[currentlyInBuffer-1]))*100)/100;
                break;
            case '-':
                temporaryDecimal = round((atof(buffer[currentlyInBuffer-2]) - atof(buffer[currentlyInBuffer-1]))*100)/100;
                break;
            case '*':
                temporaryDecimal = round((atof(buffer[currentlyInBuffer-2]) * atof(buffer[currentlyInBuffer-1]))*100)/100;
                break;
            case '/':
                if(atof(buffer[currentlyInBuffer-1]) == 0.0)
                    printf("division by zero\n");
                else
                    temporaryDecimal = round((atof(buffer[currentlyInBuffer-2]) / atof(buffer[currentlyInBuffer-1]))*100)/100;
        }

        for(int i = currentlyInBuffer-3; currentlyInBuffer > i; currentlyInBuffer--)
            memset(buffer[currentlyInBuffer], SIZE, '\0');

        gcvt(temporaryDecimal, 10, buffer[currentlyInBuffer++]);

        for(int i = 0; i <= currentlyInBuffer; i++){
            if(i == currentlyInBuffer)
                printf("%0.2f \n", roundf(atof(buffer[i]) * 100) / 100);
            else
                printf("%0.2f ", roundf(atof(buffer[i]) * 100) / 100);
        }

        return true;
    }
    else{
        printf("bad input\n");
    }
}

int main() {
    char buffer[SIZE][SIZE];
    for(int i = 0; i < SIZE; i++)
        memset(buffer[i], '\0', SIZE);

    for(; fgets(buffer[currentlyInBuffer], SIZE, stdin); currentlyInBuffer++)
        if(!calculatorLogic(buffer))
            return 0;

    if(buffer[currentlyInBuffer][0] == '\0')
        printf("no input\n");

    return 0;
}