1029 旧键盘 (20 分)

#include <stdio.h>
#include <ctype.h>

int main()
{
    char a[82],b[82],c[82];
    int i=0,j=0,k=0,m,flag;

    gets(a);
    gets(b);

    while (a[i]!='\0')
    {
        flag = 1;
        if (a[i]==b[j])
        {
            if (b[j+1]!='\0')
                j++;
        }   
        else
        {
            for (m=0;m<k;m++)
            {
                if (c[m]==a[i])
                {
                    flag = 0;
                    break;
                }
                if (islower(a[i])&&c[m]==(a[i]-32))
                {
                    flag = 0;
                    break;
                }
            }
            if (flag == 1)
            {
                if (islower(a[i]))
                    c[k] = a[i] - 32;
                else
                    c[k] = a[i];
                k++;
            }
        }
        i++;
    }

    for (i=0;i<k;i++)
        printf("%c",c[i]);

    return 0;
}