Write a program that reads a list of integers from input and outputs the list with the first and last numbers swapped. A negative one $(-1)$ indicates the end of the input and should not be stored in the array. Assume the list contains fewer than $20$ integers.

Ex: If the input is:

$12345678-1$

the output is:

$82345671$

For coding simplicity, follow every output value by a space, including the last one. The output should end with a newline.

Note: your program must input all the values into the array, and then change $($modify$)$ the first and last elements in the array, and then output the resulting modified array.

Do not use functions. Do not use vectors.