#include <bits/stdc++.h>

using namespace std;

char a[100005], b[100005];

int main() {
    while (~scanf("%s%s", a, b)) {
        int start = 0, lenb = strlen(b), lena = strlen(a);
        for (int i = 0; i < lenb; i++) {
            if (a[start] == b[i])
                start++;
            if (start == lena) {
                printf("Yes\n");
                break;
            }
        }
        if (start != lena)
            printf("No\n");
    }
    return 0;
}