View Compilation Error

0_0_18842993_21605.cpp: In function 'int main()':
0_0_18842993_21605.cpp:52:17: error: 'b' was not declared in this scope
                 b=1;
                 ^
0_0_18842993_21605.cpp:55:46: error: 'b' was not declared in this scope
             if (((s[i]>='a')&&(s[i]<='z'))&&(b==1))
                                              ^