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#include <stdio.h>
int main()
{
FILE *f = fopen("INP.TXT", "r");
short m, n, i, a;
char b[10000] = {};
fscanf(f, "%hd %hd", &n, &m);
for (i = 0; i < m; i++) {
fscanf(f, "%hd", &a);
b[a - 1] = 1;
}
fclose(f);
f = fopen("OUT.TXT", "w");
fprintf(f, "%hd\n", n - m);
for (i = 0; i < n; i++)
if (!b[i])
fprintf(f, "%hd ", i + 1);
fputc(10, f);
fclose(f);
return 0;
}
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