#include <stdio.h>
int main()
{
    char operation;
    float op1, op2, res;

    operation = getchar();
    if (scanf("%f %f", &op1, &op2) != 2) {
        printf("Error: Invalid input\n");
        return 2;
    }

    switch (operation)
    {
    case '+':
        res = op1 + op2;
        break;

    case '-':
        res = op1 - op2;
        break;

    case '*':
        res = op1 * op2;
        break;

    case '/':
        if (op2 == 0) {
            printf("Error: divide by zero\n");
            return 2;
        }
        res = op1 / op2;
        break;
    
    default:
        printf("Error: invalid operation\n");
        return 1;
    }

    printf("%c %f\n", operation, res);

    return 0;
}