#include <stdio.h> int main(void){ char str[20] = {'\0'}; int i = 0; int num_low = 0; fgets(str, 20, stdin); while ('\0' != str[i]) { if (('a' <= str[i]) && ('z' >= str[i])) { num_low++; } i++; } printf("%d\n", num_low); return 0;}