#include <stdio.h>
#define DBS '\\'
void main()
{
    int c;
    while((c=getchar())!=EOF)
    {
        if(c=='\t')
        {
            putchar(DBS);
            putchar('t');
        }
        else if(c==' ')
        {
            putchar(DBS);
            putchar('b');
        }
        else if(c=='\\')
        {
            putchar(DBS);
              putchar(DBS);
        }
        else
            putchar(c);
    }
    printf("\n%d\n",c);
}
jh fhj     jkhfh\
jh\bfhj\t\bjkhfh\\

 

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