// Faulty Sensor
// We are measuring some data with using some sensors that store their data in integer arrays. However, there is a defect with this model of sensor that will cause exactly one data point to be dropped, the remaining elements in the array shifted to the left, and the final position replaced with random data.
// Given the readings of the two sensors measuring the same thing over the same period (and therefore having the same sized array), and assuming at most one of them are at fault (losing at most one data point), determine which, if any, of the two sensors are faulty:
// Example:

// In:
// [1, 2, 3, 4]
// [1, 3, 4, -1]
// Out: 2 <- second array