#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[151],b[151],s=0,s1=0; cin>>a>>b; for(int i=1;1<=151;i++){ if(a[i]=='\0') break; else s++;} for(int i=1;1<=151;i++){ if(b[i]=='\0') break; else s1++;} if(s==s1) cout<<"yes"; else cout<<"no"; return 0; }