#include<stdio.h>int main(){int month, year;scanf_s("%d-%d",&year, &month);switch (month){case 2:if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0){printf("29天");}else printf("28天");break;case 4:case 6:case 9:case 11:printf("30天"); break;default:printf("31天");}}
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