#include <stdio.h>
#define S(x) #x
#define S2(x) S(x)
#define F(INSERT) int main(){ const char STR[] = "#include <stdio.h>\n#define S(x) #x\n#define S2(x) S(x)\n#define F(INSERT) " INSERT "\nF(S2(F(INSERT)))"; for(int i=0; i<sizeof(STR) - 1; i++){char c = fgetc(stdin); if(c != STR[i]) {printf("%d\n\"%c\"\n\"%c\"\n", i, STR[i], c); return 0;}}}
F(S2(F(INSERT)))