//简单粗暴，要你变好
#include<iostream>
#include<cstring>
#include<unordered_map>

using namespace std;

int main()
{
    string a,b;
    cin>>a>>b;

    unordered_map<char,int> S;
    for(auto c:a) S[c]++; 
    for(auto c:b) S[c]--;

    int sp=0,sn=0;
    for(auto item :S)
        if(item.second>0) sp+=item.second;
        else sn-=item.second;

    if(sn) printf("No %d\n",sn);
    else printf("Yes %d\n",sp);

    return 0;
}