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- #include<stdio.h>
- #include<string.h>
- int main ()
- {
- char a[100000],b[100000];
- int i,j=0;
- gets(a);
- int l=strlen(a);
- if(l==1)
- {
- if(a[0]>='a'&&a[0]<='z')a[0]=a[0]-32;
- printf("%c\n",a[0]);
- }
- else
- {
- for(i=0;i<l;i++)
- {
- if(a[i]>='A'&&a[i]<='Z') j+=1;
- }
- if(j==l)
- {
- for(i=0;i<l;i++)printf("%c",a[i]+32);
- }
- else
- {
- if(a[0]>='a'&&a[0]<='z')a[0]=a[0]-32;
- printf("%c",a[0]);
- for(i=1;i<strlen(a);i++)
- {
- if(a[i]>='A'&&a[i]<='Z')printf("%c",a[i]+32);
- else printf("%c",a[i]);
- }
- }
- printf("\n");
- }
- return 0;
- }
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