#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 a[150],b[150]; int al=0,bl,i=0; cin>>a>>b; while(a[i]!='\0'){ al++;i++; } bl=0; i=0; while(b[i]!='\0'){ al++;i++; } if(al==bl){ cout<<"yes"; } else cout<<"no"; return 0; }