#include <stdio.h>
#include "stack.h"

#define MAX_EXPRESSION_LENGTH 60

long long evaluate(const char *expression)
{
    /*
        TODO
        
        return evaluated expression value.
        return -1 if expression is invalid.

        [HINT]
        You can store character values in the stack if needed, 
        as characters are treated as numeric values in C.
    */

    long long ret=-1;
    
    Stack stack;
    stack_init(&stack);

    return ret;
}

int main(void)
{
    int test_count;
    char expression[MAX_EXPRESSION_LENGTH + 1];

    if (scanf("%d", &test_count) != 1) return 0;
    for (int i = 0; i < test_count; i++) {
        if (scanf("%60s", expression) != 1) return 0;
        printf("%lld\n", evaluate(expression));
    }
    return 0;
}