for (int i=0; i<=6; i++) cin>>a[i];

a[0]:=-1; a[1]:=2; a[2]:=-1; a[3]:=2; a[4]:=-1; a[5]:=-3;

cin<<a[1] <<a[2] <<a[3] <<a[4] <<a[5]<<a[6];

іnt a [] ={ 31, 28, 31, 30, 31, 30};

cout<<a[0] <<a[1] <<a[2] <<a[3] <<a[4] <<a[5];