View Compilation Error

0_0_29210682_18778.cpp:12:5: error: missing terminating ' character
     for (int i=0; i<lena; i++)na[lena-1-i]=a[i]-'0
     ^
0_0_29210682_18778.cpp: In function 'int main()':
0_0_29210682_18778.cpp:12:48: error: expected primary-expression at end of input
     for (int i=0; i<lena; i++)na[lena-1-i]=a[i]-'0
                                                ^
0_0_29210682_18778.cpp:12:48: error: expected '}' at end of input
0_0_29210682_18778.cpp:12:48: error: expected '}' at end of input