程序代码：

#include <stdio.h>
#include <string.h>

int is_start_with(int a, int b)
{
    char astr[20], bstr[20];
    sprintf(astr, "%d", a);
    sprintf(bstr, "%d", b);
    return strstr(astr, bstr) == astr;
}

int main(void)
{
    int a, b;
    scanf("%d%d", &a, &b);
    is_start_with(a, b) ? puts("Yes") : puts("No");   
    return 0;
}