ll@N,@K,b=1,L;string@S[N],@T[N];rep(k,K){string s[L=(N+(K-1-k))/K],t[];rep(i,k,N,K)s[i/K]=S[i],t[i/K]=T[i];sortA(L,s);sortA(L,t);b&=AND[i,0,L](s[i]==t[i]);}wt(b?"Yes":"No");