#include <stdio.h>
#include <ctype.h>

int main( int argc, char** argv ) {

    enum{start,test_valid,digit_test,test_digit,E__,test_digit_E,test_valid_final_E,test_valid_2,test_valid_final_final,test_valid_final} state=start;
    FILE *in=stdin,*out=stdout;

    if(argc > 1)
    {
        in = fopen(argv[1],"r");
        if (in== NULL)
        {
            fprintf(stderr,"Soubor %s sa nepodarilo otvorit\n",argv[1]);
        }
    }
    if(argc > 2)
    {
        out = fopen(argv[2],"w");
        if (out == NULL)
        {
            fprintf(stderr,"Soubor %s sa nepodarilo otvorit\n",argv[2]);
        }
    }

    char ch;

    while((ch=fgetc(in))!=EOF)
    {
        switch (state) {
        case start:
            if(ch=='+' || ch=='-')
            {
                state=test_digit;
                fputc(ch,out);
            }
            else if(ch=='.')
            {
                state=test_digit;
                fputc(ch,out);
            }
            else if (isdigit(ch))
            {
                state=test_digit;
                fputc(ch,out);
            }
            break;

        case test_digit:
            if (isdigit(ch))
            {
                state=test_digit;
                fputc(ch,out);
            }
            else if(ch=='.')
            {
                state=test_valid_final;
                fputc('.',out);
            }
            else if (ch == 'E')
            {
                fputc('E',out);
                state = test_digit_E;
            }
            else
            {
                state=test_valid_final_final;
                printf("B");
            }
            break;

        /*case test_valid:
            if(isdigit(ch))
            {
                state=test_valid_2;
                fputc(ch,out);
            }
            break;*/
        case test_digit_E:
            if (isdigit(ch))
            {
                state=test_digit_E;
                fputc(ch,out);
            }
            else if(ch=='.')
            {
                state=test_valid_final_E;
                fputc('.',out);
            }
            else
            {
                state=test_valid_final_final;
            }
            break;

        case E__:
            break;

        case test_valid_final_E:
            state=start;
            fputc(ch,out);
            printf(" - nevalidni\n");
            break;

        case test_valid_final:
            fputc(ch,out);
            state = test_digit;
            break;

        case test_valid_final_final:
            printf("BEPIS");
            printf(" - validni\n");
            state = start;
            break;

        default:
            break;
        }
    }
    fclose(in);
    fclose(out);

	return 0;
}