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#include        <ctype.h>

toupper(int c)
{

        if(c < 'a' || c > 'z')
                return c;
        return (c-'a'+'A');
}

tolower(int c)
{

        if(c < 'A' || c > 'Z')
                return c;
        return (c-'A'+'a');
}