#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char s1[1001]; char s2[1001]; int a1=0,a2=0; cin>>s1>>s2; a1=strlen(s1); a2=strlen(s2); if(a1=a2) if(a1==a2) cout<<"yes"<<endl; else cout<<"no"<<endl; return 0; }