#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() { int s1=0,s2=0; string a,b; cin>>a>>b; while (a[s1]!='\0'){ s1++; } while (b[s2]!='\0'){ s2++; } if(s1==s2){ cout<<"yes"; }else{ cout<<"no"; } return 0; }