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