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

char stack[50][50];
int top = -1;
void clear_stack()
{
    top = -1 ;
}

void push(char *s)
{
    strcpy(stack[++top], s) ;
}
char* pop()
{
    return stack[top--];
}
int is_operator(char x)
{
    if(x == '+' ||x == '-'||x == '*'||x == '/')
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

//function to Convert prefix to Postfix
void convert(char *exp)
{
    clear_stack() ;
    int i,l;
    char op1[50],op2[50];
    l = strlen(exp);
    //scanning from right to left
    for(i = l - 1; i >= 0; i--)
    {
        //checking if the symbol is an operator
        if (is_operator(exp[i]))
        {
            //popping two operands from stack
            strcpy(op1, pop()) ;
            strcpy(op2, pop()) ;;
            //concating the operands and operator
            strcat(op1 , strcat(op2 , (char[2]) {(char)exp[i], '\0'})) ;
            //Pushing the temporary string to stack
            push(op1);
        }
        //if it is an operand
        else
        {
            //push the operand to the stack
            push((char[2]){(char)exp[i], '\0'});
        }
    }

    //printf("The postfix expression is: %s",stack[top].c_str());
    printf("%s\n",stack[top]);
}

int main()
{
    char exp[50];
    printf("Enter the prefix expression: ");
    scanf("%s",exp);
    convert(exp);
    return 0;
}