$(\pi,V) $ is the permutation representation of the symmetric group $S_5 $, $ V=C^5$ and the action of standard basis vectors of $ V$ is given by $\pi(\sigma)e_i=e_{\sigma(i)} $ for $\sigma\in S_5
$ $i=1,...,5$
**Show that $(\pi , V) $ is not irreducible by finding a suitable G-invariant subspace.**

Now I know that a subspace $W\in V $ is G-invariant if $\pi(g)W\in W $ for all $g \in G $, and V is irreducible if the only G-invariant subspaces are 0 and V.

How can I find G-invariant subspaces for this permutation representation, to prove reducibility? Thank you