View Compilation Error

0_0_23051173_16326.cpp: In function 'int mian()':
0_0_23051173_16326.cpp:10:27: error: 'Y' was not declared in this scope
      if(y%4==0&&y%100!=0||Y%400==0)
                           ^
0_0_23051173_16326.cpp:13:6: error: 'else' without a previous 'if'
      else
      ^