Spiral

Consider all positive integers written in the following manner (you can imagine an infinite spiral).

Your task is to determine the position (row,column) of a given number $N$, assuming that the center (number $1$) has position $(0,0)$. Rows are numbered from top to bottom, columns are numbered from left to right (for example, number $3$ is at $(1,1)$). Your program should output a string containing the position of $N$ in the form (R,C) where $R$ is the row and $C$ is the column. $R$ and $C$ must not contain any leading zeroes.