Three Dimensional Geometry: JEE Main 2021 Mathematics question

Let $\lambda$ be an integer. If the shortest distance between the lines x $-$ $\lambda$ = 2y $-$ 1 = $-$2z and x = y + 2$\lambda$ = z $-$ $\lambda$ is ${{\sqrt 7 } \over {2\sqrt 2 }}$, then the value of | $\lambda$ | is _________.