#include <stdio.h> int census(int L,int R) { int count = 0; for(int i = L;i<=R;i++) { if(i%10==2) count++; if(i%100/10==2) count++; if(i%1000/100==2) count++; if(i%10000/1000==2) count++; } return count; } int main() { int L,R; scanf("%d %d",&L,&R); int k = census( L,R); printf("%d",k)...