#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
    char s1[20],s2[20];
    scanf("%s",s1);
    scanf("%s",s2);
    if(strlen(s1)<1||strlen(s1)>10||strlen(s2)<1||strlen(s2)>10){
        printf("Invalid input");
        return 0;
    }
    for(int i =0;s1[i];i++)
    if(!isalpha(s1[i]))
    {
        printf("Invalid input");return 0;}
        for(int i=0;s2[i];i++)
        if(!isalpha(s2[i]))
        {printf("Invalid input");return 0;}
        if(strlen(s1)!=strlen(s2)){
            printf("No");
            return 0;
        }
        for(int i=0;i<strlen(s1)-1;i++)
        for(int j=i+1;j<strlen(s1);j++){
            if(s1[i]>s1[j]){char
            t=s1[i];s1[i]=s1[i];s1[j]=t;}
            if(s2[i]>s2[j]){char
            t=s2[i];s2[i]=s2[j]=s2[j];s2[j]=t;}
        }
        if(strcmp(s1,s2)==0)
        printf("Yes");
        else printf("No");
        return 0;
    }
}